read dress

Read/write lock pattern

In this pattern, multiple readers can read the data in parallel but an exclusive lock is needed while writing the data. When a writer is writing the data, readers will be blocked until the writer is finished writing.

The current edition of the POSIX standard includes a read-write lock in the form of pthread_rwlock_t and the associated operations

Java version 5 or above includes an interface named java.util.concurrent.locks.ReadWriteLock that allows the use of this pattern.